Overview
The ZF 0501.213.502 COUPLING is a critical torque-transfer component engineered specifically for the WG 131 Series transmission. This OEM genuine part sits within the driveline assembly, connecting the engine output to the transmission input shaft to ensure smooth power delivery and dampen torsional vibrations. The SKU 0501.213.502 is precision-machined to maintain alignment and reduce wear on adjacent assemblies, such as the 4656101028: TRANSMISSION HOUSING and the 4656301066: HOUS.FRONT SECT. Without this coupling, the gearbox cannot properly engage under load, making it essential for heavy-duty industrial applications.
Symptoms of Failure
- Torque fluctuation during acceleration: A worn 0501.213.502 coupling causes uneven power transfer, leading to jerky starts or hesitation when shifting gears.
- Metallic grinding noise from the bell housing: As the coupling splines degrade, you may hear a distinct scraping sound, especially at low RPMs.
- Oil seepage near the input shaft seal: A failing coupling can misalign the shaft, breaking the seal and causing transmission fluid leaks.
- Vibration at highway speeds: Excessive play in the coupling creates harmonic vibrations that resonate through the chassis, often mistaken for wheel balance issues.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0501.213.502 |
| Material | High-tensile alloy steel with nitrided surface |
| Outer Diameter | 112 mm |
| Inner Diameter | 45 mm |
| Length | 85 mm |
| Weight | 1.4 kg |
| OEM Reference | ZF 0501.213.502 (Genuine) |
| Torque Capacity | 850 Nm |
Compatibility
This coupling is primarily designed for the WG 131 Series transmission, but it also fits select models in the WG180, WG200, and WG250 families due to shared spline geometry. It is a direct replacement for units requiring the 4656201015: SCREEN SHEET and the 4656301037: TUBE within the same assembly. Always verify your transmission serial number before ordering, as variations exist in early WG131 builds.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101028 | TRANSMISSION HOUSING | Encloses and supports all internal gearbox components |
| 4656301066 | HOUS.FRONT SECT | Front section housing for input shaft and coupling |
| 4656201015 | SCREEN SHEET | Filter screen protecting oil flow from debris |
| 4656301037 | TUBE | Oil delivery tube for lubrication channels |
| 0634313514 | O-RING | Seals fluid passages between housing sections |
| 0636100803 | CAP SCREW | Fastens housing flanges with high torque rating |
| 4656301042 | HOUSING REAR PART | Rear housing section supporting output shaft |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for precise housing mating |
| 0636100801 | CAP SCREW | Secondary fastener for front housing attachment |
| 0636100160 | CAP SCREW | M10 bolt for rear housing retention |
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